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5 Sheets-Sheet 1.

(No Model.)

A. w. 37,- z. W. DAW. OONSTRUGTION 0F STANDS 0R TRIPODS FOR ROCK DRILLS, &c.

No. 487,256. Patented Dec. 6, 1892.

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(No Model.) 5 Sheets-Sheet 2.

A. W. 8; Z. W. DAW.

CONSTRUCTION OF STANDS 0R TRIPODS FOR ROCK DRILLS, am. No. 487,256. Patented Dec. 6, 1892.

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(No Model.) 5 Sheets-Sheet 3.

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CONSTRUCTION OF STANDS OR TRIPODS FOR ROCK DRILLS, &c.

No. 487,256. Patented Dec. 6, 1892.

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5 sheets sheet 5 (No Model.) v f A. W. & Z. W. DAW. CONSTRUCTION OF STANDS 0R TRIPODS FOR ROGK DRILLS, 8w.

Patented Dec. 6, 1892.

I Witnesses:

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Nrr STATES JATENT Fries.

ALBERT WILLIAMS DAW AND ZACHARIAS WVILLIAMS DAIV, OF LAURVIG, NORWAY.

CONSTRUCTION OF STANDS ORTRIPODS FOR ROGK-DRILLS, 800.

SPECIFICATION forming part of Letters Patent No. 487,256, dated December 6, 1892.

Application filed. April 5, 1892. Serial No. 427,891- (No model.)

To aZZ whom, it may concern:

Be it known that we, ALBERT WILLIAMS DAW and ZACHARIAS WILLIAMS DAW, mining engineers, both subjects of the Queen of Great Britain, residing at Laurvig, in the Kingdom of Norway, have invented certain new and useful Improvements in the Construction of Stands or Tripods for Rock-Drills and of the means for mounting such drills thereon, and also of the cradles of such drills, of which the following is a specification.

The invention relates to improvements in tripods or stands of rock-drills and in the means for mounting the cradle of the drill thereon, whereby complete universal adjustment is given to all the legs of the tripod or stand, which are also made telescopic, so that the stand can be fixed in any position on the most irregular ground and the drill adjusted to bore holes in any required direction from Vertical to horizontal. Further, the tripod or stand is constructed so as to combine strength with rigidity and steadiness, portability, and simplicity of adjustment. By our improvements in the cradle the wear of the drill-cylinder in the guides is automatically taken up.

and just sufficient resistance automatically given to the free movement of the drill-cylinder in the cradle-guides as torelieve the feedscrew and nut of all shock of the recoil of the drill, whereby the feed-screw and nut are greatly relieved of wear. Further, the cradle is designed to combine great strength with rigidity and simplicity of construction.

Our improvements are illustrated in the accompanying drawings, in which Figure 1 is a vertical section, partly in elevation, of the tripod or stand; Fig. 2, a vertical section of Fig. 1, taken at right angles thereto. Fig. 3 is a plan view of Figs. 1 and 2. Fig.4 is a front elevation of the tripod or stand, showing the drill-cradle mounted directly on the head of such stand, the cradle being in cross-section. Fig. 5 is a longitudinal section of Fig. 4. Fig. 6 is a side elevation, partly in section, of the tripod or stand, showing the drill-cradle mounted on a bar pivoted to the head of such stand, the cradle being of a slightly-modified construction; and Fig. 7 is a cross-section of the cradle shown in Fig. 6.

Our improvements in the tripod or stand of rock-drills relate 'to the method of connecting the legs thereof to the head in such a way as to permit such legs to be turned in any direction in relation thereto, and thus enable the drill carried by the stand to be readily and rigidly fixed in any required position, no matter where the drill has to work. For this purpose each legAis pivoted to a pin B, carried by a part 0, which in its turn is pivoted at D to the head E of the stand, the two pivots B and D being in planes at right angles to each other, so as to permit of the leg being turned in any direction. The pivots B and D have screw-threaded ends, and a clamping-nut F binds on the part which turns thereon, so as to fix same rigidly after it has been turned to the required position.

In order to more readily and certainly insure the rigidity of the parts when fixed, We make the portion a. of the leg A, which is mounted on the pivot B,ofa conical form and cause it to enter a corresponding seat in the part O, which is pivoted to. the head E, and such part 0 has also a corresponding conical portion 0 entering a similar seat in such head E. The tightening of the clamping-nuts F causes the conical parts a and c to be forced Well home to their seats and binds same rigidly therein. In the drawings a single pivot D at the front of the head Eserves to receive and fix both of the front legs A; but a separate pivot might, if desired, be provided for each of such front legs.

The cradle G of the drill is attached to and can revolve freely on the head E of the tripod or stand, for which purpose such head is preferably made of forked form, as shown, and the two arms e c of the fork are connected by a round bar E, which a bearing or plumber block H, formed on the under side of the eradle G, embraces, so that the cradle and drill can turn on such bar E to any required position, and by then tightening up the bearing or plumber block H by means of the bolts and nuts it so that it clamps the bar the drill will be rigidly fixed in such position.

In order to permit of the adjustment of the drill in any direction on the head E, instead of mounting the cradle of same directly on. the head of the stand We may, as shown in Fig. 6, mount a bar I so that it can pivot on the bar E of the head with means-such as the bolts and nuts i-for clamping same thereon, and then mount the cradle on such bar, so that it can pivot round same and be clamped thereon in the required position in the same manner as previously described, when the cradle is mounted directly on the head.

The cradle-guides g, which carry the drillcylinder, are preferably made V-shaped, as shown, and correspond to similar projections on the drill-cylinder.

In each of the lower guides of the cradle a recess is made to receive a liner 70, which is held in position by bolts Z at each end of the cradle, (see Fig. 5,) such liners being prevented from endwise movement by ears or parts bent down over each end of the cradle. Springs m, of any suitable form, are inserted below the liners 7c. The drillcylinder is placed in its guides g g, and the boltsi, holding the liner in position, are loosened, when the springs m cause the liner k to take up any play there may be between the projections on the drill-cylinder and the guides g of the cradle, and also all wear caused by the movement of the drill-cylinder in the guides. Further, the springs m are given sufficient tension to cause the liner to force the projections on the drill-cylinder between it and the top guides g of the cradle just strongly enough to give sufficient friction to prevent the too free movement of the drill-cylinder in the cradleguides, and thus to overcome therecoil of the drill when running while allowing its cylinder to be fed forward readily by the feed- Screw, thereby relieving the feed-screw and nut from the shock of the recoil and thus practically from all wear. The tension of the springs m within their limits can be controlled by loosening or tightening the bolts t, holding the liners 7c in position.

In Figs. land 5 the springsm are shown acting directly on the back of the liners It to force same outward, such springs being arranged at right angles to the top surface of the liners, while in the slight modification shown in Figs. 6 and 7 such springs are arranged at right angles to the axis of the eradle, and a follower o with an inclined outer surface is interposed between the springs m and the liners k, the action being similar in both arrangements.

It will be readily understood that any other arrangement and form of springs other than those shown maybe employed for forcing the liners outward.

What we claim as our invention, and desire to secure by Letters Patent, is

1. The improved tripod or stand for rockdrills, consisting in a head E, adapted to receive the drill and which is provided with as many conical seats as the stand has legs, parts 0, each havinga conical projection c to enter one of such seats, bolts D and nuts F for tightening or binding such parts 0 in the seats of the head, each part 0 also having a conical seat in a plane at right angles to its conical projection c, a conical projection a, formed on each leg A and entering the conical recess in one of the parts 0, and bolts B and nuts F for tightening or binding each leg A in the seats of parts 0, substantially as set forth.

2. In a cradle for rock-drills, the combination of a liner mounted in a recess in the guides thereof and of a spring or springs acting upon the rear of such liner, substantially as and for the purpose specified.

ALBERT WILLIAMS DAW. ZACHARIAS WILLIAMS DAW'.

Witnesses to the signature of the abovenamed Albert Williams Daw:

A. ENJE, HERRIOK FINNE. WVitnesses to the signature of the abovenamed Zacharias Williams Daw:

CHAs. A. ALLIsoN, HARRY A. MCLELLAN. 

